Temperature Coefficient:The rate of change in magnetic property with respect to temperature. Expressed as percent change per unit of temperature.Anisotropic: (a.k.a Magnetically Oriented)The material has a predefined direction of magnetic orientation

Coercive Force: HcbThe magnetic field H which must be applied to a magnetic material in a symmetrical, cyclicly magnetized fashion, to make the magnetic induction B vanish.

Curie Temperature: TCTemperature at which a material loses its magnetic properties.

Gauss: GUnit of magnetic induction in the electromagnetic and Gaussian systems of units, equal to 1 maxwell per square centimeter.

Hardness: HRBA measure of the resistance of a material to surface indentation or abrasion.

Isotropic:A magnet material whose magnetic properties are the same in any direction, and which can therefore be magnetized in any direction without loss of magnetic characteristics.

Magnetic Flux:The total magnetic induction over a given area. When the magnetic induction, B, is uniformly distributed over an area A, Magnetic Flux = BA.

Magnetic Induction: B (a.k.a Magnetic Flux Density)Flux per unit area of a section normal to the direction of the magnetic path. Measured in gauss.

Maximum Energy Product: BHmaxThe point on the Demagnetization Curve where the product of B and H is a maximum and the required volume of magnet material required to project a given energy into its surroundings is a minimum.

Maximum Operating Temperature: TmaxThe maximum temperature of exposure that a magnet can forego without significant long-range instability or structural changes.

Recoil Permeability: µr The ratio of change in flux density as a function of incremental change in applied field (H) in the vicinity of H=0. It has no dimensions in either the MKSA or CGS system.

Residual Induction: Br (a.k.a residual flux density; residual magnetic induction; residual magnetism)The magnetic flux density at which the magnetizing force is zero when the material is in a symmetrically and cyclically magnetized condition.